There are 30 students in a class. 12 of them play basketball, 15 of them play fo

游客2024-01-12 28

问题 There are 30 students in a class. 12 of them play basketball, 15 of them play football, and 19 of them play pingpang. If 7 of them play all three activities and exactly 6 of them play two activities, how many of them play none of the three activities?

选项 A、2
B、0
C、8
D、4
E、6

答案 D

解析设玩三种运动的人分别为A，B，C，A=12，B=15，C=19，7个人三种运动都玩，那么P=7，6个人玩两种运动，那么m=6，代入公式：30=12+15+19-6-2×7+N，得到N=4，选择D。

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There are 30 students in a class. 12 of them play basketball, 15 of them play fo

Inahistoryclassthatconsistedof30students,thenumberofseniorswas3mo

Inagraduatingclassof236students,142tookalgebraand121tookchemistry.

Amongthe900spectatorsatafootballgame,therewasatotalofxstudentsfro

Jimscored95pointsin5basketballgamesforhisschool.Atthisrate,howman

Apollof2,000studentswastakenbeforeCentervilleCollegechangedthenam

Averageexpectedfamilycontribution(EFC)fordependentstudents,

Aschoolbushas10doubleseatsineachof2rows.Twostudentscansitineach

Jimscored95pointsin5basketballgamesforhisschool.Atthisrate,howman

Mr.Hernandez’sstudentsfilledoutasurveyaskinghowmanyhourseachstudent

Asubsandwichandasodaatabasketballgame’sconcessionstandcosts$3.40.A

[audioFiles]audio_eusm_j01_141(20099)[/audioFiles]A、Hiserrorsweremainlyint

Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsan

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某初产妇34岁，妊娠39周，规律宫缩2小时，宫口开大4cm，给予肌内注射缩宫素3

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